Posted on August 04, 2017 at 10:11Well I'm really confused right now. Today I've started debugging the same code as yesterday and FWWERR disappeared. I've tried both versions - with debugger attached and standalone. I'm trying to recreate the situation that caused FWWERR error right now. I'll let you know when something changes. The flash is still empty.
Edit:
OK, I got this error once again. This is my test code:
(with ST's example code from L0 snippets my uC behaves the same way)
volatile uint8_t flag_from_isr = 0;
int main(void){
SystemCoreClockUpdate();
bl_SystemInit(); // initialize nvm, pwr, bootloader uart, ...
uint8_t test = 0xFF;
bl_uart_send(&test, 1);
// currently 0x08010000 (...) is empty so there's no need to erase
/* prepare some data */
uint32_t dummydata[32], i;
for(i=0; i<32; i++){
dummydata[i] = i;
}
test = 0x1;
bl_uart_send(&test, 1);
nvm_prog_write_halfpages((uint32_t *) 0x08010000, &dummydata[0], 2); // write 2 half-pages at the beginning of flash bank 2
test = 0x2;
bl_uart_send(&test, 1);
while(1){
/* check if FWWERR occured */
if(flag_from_isr == 1){
flag_from_isr = 0;
test = 0xea;
bl_uart_send(&test, 1);
}
}
}
------------ and in another file-----------
extern uint8_t flag_from_isr;
void FLASH_IRQHandler(void){
volatile uint32_t source = FLASH->SR;
if((source & (1 << 17)) == (1 << 17)){
flag_from_isr = 1;
}
FLASH->SR |= (source & 0xFFFFFFF2); // clear all flags
}
On the oscilloscope there's a following sequence:
0xFF, 0x01, (about 350 us of delay) 0x02, 0xEA
